diff --git a/packages/studio/src/components/StudioRightPanel.tsx b/packages/studio/src/components/StudioRightPanel.tsx
index b55aac305..68088311f 100644
--- a/packages/studio/src/components/StudioRightPanel.tsx
+++ b/packages/studio/src/components/StudioRightPanel.tsx
@@ -401,8 +401,8 @@ export function StudioRightPanel({
         onUpdateArcSegment={handleUpdateArcSegment}
         onUnroll={handleUnroll}
         onUpdateKeyframeEase={handleUpdateKeyframeEase}
-        onSetAllKeyframeEases={handleSetAllKeyframeEases}
         onUpdateSegmentEase={handleUpdateSegmentEase}
+        onSetAllKeyframeEases={handleSetAllKeyframeEases}
         recordingState={recordingState}
         recordingDuration={recordingDuration}
         onToggleRecording={onToggleRecording}
diff --git a/packages/studio/src/components/editor/GsapAnimationList.tsx b/packages/studio/src/components/editor/GsapAnimationList.tsx
new file mode 100644
index 000000000..9a88e129f
--- /dev/null
+++ b/packages/studio/src/components/editor/GsapAnimationList.tsx
@@ -0,0 +1,84 @@
+import { useCallback, useState } from "react";
+import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
+import { useShallow } from "zustand/react/shallow";
+import { useTrackDesignInput } from "../../contexts/DesignPanelInputContext";
+import { usePlayerStore } from "../../player";
+import { isFocusedEaseRequestCurrent } from "../../player/store/keyframeSlice";
+import { AnimationCard } from "./AnimationCard";
+import { GsapAddAnimationControl } from "./GsapAddAnimationControl";
+import {
+  type GsapAnimationEditCallbacks,
+  withTrackedGsapAnimationCallbacks,
+} from "./gsapAnimationCallbacks";
+
+interface GsapAnimationListProps extends GsapAnimationEditCallbacks {
+  elementId: string;
+  animations: GsapAnimation[];
+  onAddAnimation: (method: "to" | "from" | "set" | "fromTo") => void;
+  variant: "classic" | "flat";
+}
+
+/** Shared animation cards, telemetry, and timeline-ease focus ownership for both inspectors. */
+export function GsapAnimationList({
+  elementId,
+  animations,
+  onAddAnimation,
+  variant,
+  ...callbacks
+}: GsapAnimationListProps) {
+  const track = useTrackDesignInput();
+  const [addMenuOpen, setAddMenuOpen] = useState(false);
+  const trackedCallbacks = withTrackedGsapAnimationCallbacks(callbacks, track);
+  const { focusedEaseSegment, timelineProjectId, timelineSessionEpoch, selectedElementId } =
+    usePlayerStore(
+      useShallow((state) => ({
+        focusedEaseSegment: state.focusedEaseSegment,
+        timelineProjectId: state.timelineProjectId,
+        timelineSessionEpoch: state.timelineSessionEpoch,
+        selectedElementId: state.selectedElementId,
+      })),
+    );
+  const focusedHere =
+    focusedEaseSegment &&
+    focusedEaseSegment.elementId === elementId &&
+    isFocusedEaseRequestCurrent(focusedEaseSegment, {
+      timelineProjectId,
+      timelineSessionEpoch,
+      selectedElementId,
+    }) &&
+    animations.some((animation) => animation.id === focusedEaseSegment.animationId)
+      ? focusedEaseSegment
+      : null;
+  // Stable while the request is unchanged: AnimationCard includes this callback
+  // in its focus-effect deps, and a fresh closure would replay that effect on
+  // unrelated inspector renders. Reading the action lazily also avoids a store
+  // subscription for a function whose identity never changes.
+  const consumeFocusedEaseSegment = useCallback(() => {
+    if (focusedHere) {
+      usePlayerStore.getState().clearFocusedEaseSegment(focusedHere.nonce);
+    }
+  }, [focusedHere]);
+
+  return (
+    <div className="space-y-2">
+      {animations.map((animation, index) => (
+        <AnimationCard
+          {...trackedCallbacks}
+          key={animation.id}
+          animation={animation}
+          defaultExpanded={index === 0}
+          flat={variant === "flat"}
+          focusedSegment={focusedHere?.animationId === animation.id ? focusedHere : null}
+          onFocusSegmentConsumed={consumeFocusedEaseSegment}
+        />
+      ))}
+      <GsapAddAnimationControl
+        open={addMenuOpen}
+        setOpen={setAddMenuOpen}
+        onAddAnimation={onAddAnimation}
+        track={track}
+        variant={variant}
+      />
+    </div>
+  );
+}
diff --git a/packages/studio/src/components/editor/GsapAnimationSection.test.tsx b/packages/studio/src/components/editor/GsapAnimationSection.test.tsx
index 7d299e158..8aa5c40ea 100644
--- a/packages/studio/src/components/editor/GsapAnimationSection.test.tsx
+++ b/packages/studio/src/components/editor/GsapAnimationSection.test.tsx
@@ -5,11 +5,15 @@ import { createRoot } from "react-dom/client";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
 import { DesignPanelInputProvider } from "../../contexts/DesignPanelInputContext";
-import { usePlayerStore } from "../../player";
+import { usePlayerStore } from "../../player/store/playerStore";
 import { GsapAnimationSection } from "./GsapAnimationSection";
 
 (globalThis as unknown as { IS_REACT_ACT_ENVIRONMENT: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
 
+const animationCardMock = vi.hoisted(() => ({
+  consumers: [] as Array<{ tweenPercentage: number | null; consume: () => void }>,
+}));
+
 vi.mock("./AnimationCard", () => ({
   AnimationCard: ({
     animation,
@@ -19,22 +23,27 @@ vi.mock("./AnimationCard", () => ({
     animation: GsapAnimation;
     focusedSegment: { tweenPercentage: number } | null;
     onFocusSegmentConsumed: () => void;
-  }) => (
-    <button
-      type="button"
-      data-testid={`animation-${animation.id}`}
-      data-focused={focusedSegment ? String(focusedSegment.tweenPercentage) : ""}
-      // Mirrors the real card: the consume callback only fires from the effect
-      // that runs when this card actually received a focusedSegment.
-      onClick={() => focusedSegment && onFocusSegmentConsumed()}
-    />
-  ),
+  }) => {
+    animationCardMock.consumers.push({
+      tweenPercentage: focusedSegment?.tweenPercentage ?? null,
+      consume: onFocusSegmentConsumed,
+    });
+    return (
+      <button
+        type="button"
+        data-testid={`animation-${animation.id}`}
+        data-focused={focusedSegment ? String(focusedSegment.tweenPercentage) : ""}
+        onClick={onFocusSegmentConsumed}
+      />
+    );
+  },
 }));
 
 vi.mock("./GsapAddAnimationControl", () => ({ GsapAddAnimationControl: () => null }));
 
 afterEach(() => {
   document.body.innerHTML = "";
+  animationCardMock.consumers = [];
   usePlayerStore.getState().reset();
 });
 
@@ -76,8 +85,22 @@ function renderSection(elementId: string) {
   return { host, root, render };
 }
 
+function focusSharedAnimation(elementId: string, tweenPercentage: number) {
+  const store = usePlayerStore.getState();
+  store.beginTimelineSession("project-a");
+  store.setSelectedElementId(elementId);
+  store.setFocusedEaseSegment({
+    elementId,
+    animationId: sharedAnimation.id,
+    tweenPercentage,
+  });
+  return store;
+}
+
 describe("GsapAnimationSection", () => {
   it("consumes a shared animation id only for the focused element", () => {
+    usePlayerStore.getState().beginTimelineSession("project-a");
+    usePlayerStore.getState().setSelectedElementId("index.html#second");
     usePlayerStore.getState().setFocusedEaseSegment({
       elementId: "index.html#second",
       animationId: sharedAnimation.id,
@@ -99,4 +122,70 @@ describe("GsapAnimationSection", () => {
     expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
     act(() => view.root.unmount());
   });
+
+  it("does not let an older consumer clear a newer request", () => {
+    const store = focusSharedAnimation("index.html#first", 25);
+    const view = renderSection("index.html#first");
+    const staleConsumer = animationCardMock.consumers.at(-1)?.consume;
+    if (!staleConsumer) throw new Error("expected first focus consumer");
+
+    act(() => {
+      store.setFocusedEaseSegment({
+        elementId: "index.html#first",
+        animationId: sharedAnimation.id,
+        tweenPercentage: 75,
+      });
+    });
+    const current = usePlayerStore.getState().focusedEaseSegment;
+    if (!current) throw new Error("expected replacement request");
+
+    act(() => staleConsumer());
+    expect(usePlayerStore.getState().focusedEaseSegment).toBe(current);
+
+    const currentConsumer = animationCardMock.consumers.at(-1)?.consume;
+    if (!currentConsumer) throw new Error("expected replacement focus consumer");
+    act(() => currentConsumer());
+    expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+    act(() => view.root.unmount());
+  });
+
+  it("keeps the focus consumer stable across unrelated parent renders", () => {
+    focusSharedAnimation("index.html#first", 25);
+    const view = renderSection("index.html#first");
+    const firstConsumer = animationCardMock.consumers.at(-1)?.consume;
+    if (!firstConsumer) throw new Error("expected focus consumer");
+
+    view.render("index.html#first");
+
+    expect(animationCardMock.consumers.at(-1)?.consume).toBe(firstConsumer);
+    act(() => view.root.unmount());
+  });
+
+  it("rejects a request from an earlier project session", () => {
+    const store = usePlayerStore.getState();
+    store.beginTimelineSession("project-a");
+    store.setSelectedElementId("index.html#first");
+    store.setFocusedEaseSegment({
+      elementId: "index.html#first",
+      animationId: sharedAnimation.id,
+      tweenPercentage: 50,
+    });
+    const staleRequest = usePlayerStore.getState().focusedEaseSegment;
+    if (!staleRequest) throw new Error("expected request");
+
+    const view = renderSection("index.html#first");
+
+    act(() => {
+      store.beginTimelineSession("project-b");
+      store.setSelectedElementId("index.html#first");
+      usePlayerStore.setState({ focusedEaseSegment: staleRequest });
+    });
+
+    const card = view.host.querySelector<HTMLButtonElement>(
+      "[data-testid='animation-shared-animation']",
+    );
+    expect(card?.dataset.focused).toBe("");
+    expect(usePlayerStore.getState().focusedEaseSegment).toBe(staleRequest);
+    act(() => view.root.unmount());
+  });
 });
diff --git a/packages/studio/src/components/editor/GsapAnimationSection.tsx b/packages/studio/src/components/editor/GsapAnimationSection.tsx
index 13e2d2758..4f9e50494 100644
--- a/packages/studio/src/components/editor/GsapAnimationSection.tsx
+++ b/packages/studio/src/components/editor/GsapAnimationSection.tsx
@@ -1,16 +1,9 @@
-import { memo, useState } from "react";
+import { memo } from "react";
 import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
 import { Film } from "../../icons/SystemIcons";
 import { Section } from "./propertyPanelPrimitives";
-import { AnimationCard } from "./AnimationCard";
-import {
-  type GsapAnimationEditCallbacks,
-  withTrackedGsapAnimationCallbacks,
-  clearFocusedEaseSegment,
-} from "./gsapAnimationCallbacks";
-import { useTrackDesignInput } from "../../contexts/DesignPanelInputContext";
-import { usePlayerStore } from "../../player";
-import { GsapAddAnimationControl } from "./GsapAddAnimationControl";
+import type { GsapAnimationEditCallbacks } from "./gsapAnimationCallbacks";
+import { GsapAnimationList } from "./GsapAnimationList";
 
 interface GsapAnimationSectionProps extends GsapAnimationEditCallbacks {
   elementId: string;
@@ -21,18 +14,13 @@ interface GsapAnimationSectionProps extends GsapAnimationEditCallbacks {
 }
 
 export const GsapAnimationSection = memo(function GsapAnimationSection({
-  animations,
   elementId,
+  animations,
   multipleTimelines,
   unsupportedTimelinePattern,
   onAddAnimation,
   ...callbacks
 }: GsapAnimationSectionProps) {
-  const track = useTrackDesignInput();
-  const [addMenuOpen, setAddMenuOpen] = useState(false);
-  const trackedCallbacks = withTrackedGsapAnimationCallbacks(callbacks, track);
-  const focusedEaseSegment = usePlayerStore((s) => s.focusedEaseSegment);
-
   return (
     <Section title="Animation" icon={<Film size={15} />}>
       {multipleTimelines && (
@@ -49,31 +37,13 @@ export const GsapAnimationSection = memo(function GsapAnimationSection({
         </p>
       )}
       {multipleTimelines || unsupportedTimelinePattern ? null : (
-        <div className="space-y-2">
-          {animations.map((anim, index) => (
-            <AnimationCard
-              {...trackedCallbacks}
-              key={anim.id}
-              animation={anim}
-              defaultExpanded={index === 0}
-              focusedSegment={
-                focusedEaseSegment?.elementId === elementId &&
-                focusedEaseSegment.animationId === anim.id
-                  ? focusedEaseSegment
-                  : null
-              }
-              onFocusSegmentConsumed={clearFocusedEaseSegment}
-            />
-          ))}
-
-          <GsapAddAnimationControl
-            open={addMenuOpen}
-            setOpen={setAddMenuOpen}
-            onAddAnimation={onAddAnimation}
-            track={track}
-            variant="classic"
-          />
-        </div>
+        <GsapAnimationList
+          {...callbacks}
+          elementId={elementId}
+          animations={animations}
+          onAddAnimation={onAddAnimation}
+          variant="classic"
+        />
       )}
     </Section>
   );
diff --git a/packages/studio/src/components/editor/PropertyPanel.tsx b/packages/studio/src/components/editor/PropertyPanel.tsx
index c23359ab9..7308aca23 100644
--- a/packages/studio/src/components/editor/PropertyPanel.tsx
+++ b/packages/studio/src/components/editor/PropertyPanel.tsx
@@ -570,8 +570,8 @@ export const PropertyPanel = memo(function PropertyPanel(props: PropertyPanelPro
               onUpdateArcSegment={onUpdateArcSegment}
               onUnroll={onUnroll}
               onUpdateKeyframeEase={onUpdateKeyframeEase}
-              onSetAllKeyframeEases={onSetAllKeyframeEases}
               onUpdateSegmentEase={onUpdateSegmentEase}
+              onSetAllKeyframeEases={onSetAllKeyframeEases}
             />
           )}
 
diff --git a/packages/studio/src/components/editor/PropertyPanelFlat.tsx b/packages/studio/src/components/editor/PropertyPanelFlat.tsx
index 278dceafa..7d8e98dc2 100644
--- a/packages/studio/src/components/editor/PropertyPanelFlat.tsx
+++ b/packages/studio/src/components/editor/PropertyPanelFlat.tsx
@@ -1,5 +1,6 @@
 import { scopedElementKey } from "../../hooks/gsapKeyframeCacheHelpers";
-import { type ReactNode, useEffect, useRef, useState } from "react";
+import { useEffect, useRef, useState } from "react";
+import { useShallow } from "zustand/react/shallow";
 import { DesignPanelInputProvider } from "../../contexts/DesignPanelInputContext";
 import { slugifyDesignInput } from "../../utils/designInputTracking";
 import { isTextEditableSelection } from "./domEditing";
@@ -18,6 +19,7 @@ import { createGsapLivePreview } from "./gsapLivePreview";
 import { formatTextFieldPreview } from "./propertyPanelSections";
 import { useColorGradingController } from "./useColorGradingController";
 import { usePlayerStore } from "../../player";
+import { isFocusedEaseRequestCurrent } from "../../player/store/keyframeSlice";
 import {
   FlatColorGradingAccessory,
   FlatColorGradingSection,
@@ -31,24 +33,10 @@ import {
   deriveMediaOverlayPlacement,
   FlatOverlaysSection,
 } from "./propertyPanelFlatOverlaysSection";
-
-type FlatGroupDescriptor = {
-  id: string;
-  title: string;
-  summary?: string;
-  accessory?: ReactNode;
-  content: ReactNode;
-};
-
-// Required callback shape for the gated-off Motion effect list.
-const EMPTY_GSAP_EFFECT_HANDLERS = {
-  onAddAnimation: () => {},
-  onUpdateProperty: () => {},
-  onUpdateMeta: () => {},
-  onDeleteAnimation: () => {},
-  onAddProperty: () => {},
-  onRemoveProperty: () => {},
-};
+import {
+  EMPTY_GSAP_EFFECT_HANDLERS,
+  type FlatGroupDescriptor,
+} from "./propertyPanelFlatDescriptors";
 
 /** The flat inspector shell with one shared open-group state. */
 // fallow-ignore-next-line complexity
@@ -161,11 +149,18 @@ export function PropertyPanelFlat({
   // When the inline timeline ease button focuses a segment on this element,
   // force the Motion group open so its AnimationCard (which only mounts while
   // the group is expanded) can consume the focus and reveal the ease editor.
-  const focusedEaseSegment = usePlayerStore((s) => s.focusedEaseSegment);
-  // The element THIS panel renders, not the store's selectedElementId: that
-  // flips synchronously while the panel still renders its predecessor, so a
-  // stale panel would consume a request meant for its successor whenever the
-  // two share a class-selector animation id.
+  const { focusedEaseSegment, timelineProjectId, timelineSessionEpoch } = usePlayerStore(
+    useShallow((state) => ({
+      focusedEaseSegment: state.focusedEaseSegment,
+      timelineProjectId: state.timelineProjectId,
+      timelineSessionEpoch: state.timelineSessionEpoch,
+    })),
+  );
+  // Identity of the element THIS panel actually renders (not the store's
+  // selectedElementId, which flips synchronously on selection while the panel
+  // still renders the previous element during async DOM-selection resolution):
+  // a stale panel would otherwise consume a focus request meant for its
+  // successor when both share a class-selector animation id.
   const renderedElementId = scopedElementKey(element);
   // Adjusted during render (not an effect) so the card mounts on the same
   // commit the request lands on. Keyed on request identity: a group the user
@@ -174,8 +169,16 @@ export function PropertyPanelFlat({
   if (focusedEaseSegment !== consumedFocus) {
     setConsumedFocus(focusedEaseSegment);
     const focusesThisPanel =
-      focusedEaseSegment?.elementId === renderedElementId &&
-      gsapAnimations.some((a) => a.id === focusedEaseSegment.animationId);
+      focusedEaseSegment !== null &&
+      // A request from a previous project/session/selection is stale: it must
+      // not reopen Motion on whichever panel happens to be mounted now.
+      isFocusedEaseRequestCurrent(focusedEaseSegment, {
+        timelineProjectId,
+        timelineSessionEpoch,
+        selectedElementId,
+      }) &&
+      focusedEaseSegment.elementId === renderedElementId &&
+      gsapAnimations.some((animation) => animation.id === focusedEaseSegment.animationId);
     if (focusesThisPanel) setOpenGroupId("motion");
   }
 
diff --git a/packages/studio/src/components/editor/gsapAnimationCallbacks.ts b/packages/studio/src/components/editor/gsapAnimationCallbacks.ts
index 0fe7f1111..2e4287283 100644
--- a/packages/studio/src/components/editor/gsapAnimationCallbacks.ts
+++ b/packages/studio/src/components/editor/gsapAnimationCallbacks.ts
@@ -1,5 +1,4 @@
 import type { ArcPathSegment } from "@hyperframes/parsers/gsap-parser";
-import { usePlayerStore } from "../../player";
 import type { AnimationKeyframeTarget } from "../../hooks/gsapTweenSynth";
 
 /**
@@ -164,12 +163,3 @@ export function withTrackedGsapAnimationCallbacks(
       : undefined,
   };
 }
-
-/**
- * Stable consumer for the store's one-shot ease-focus request. Module-level on
- * purpose: an inline arrow in the section components is a dep of AnimationCard's
- * focus effect, so a fresh identity each render re-runs that effect every render.
- */
-export function clearFocusedEaseSegment(): void {
-  usePlayerStore.getState().setFocusedEaseSegment(null);
-}
diff --git a/packages/studio/src/components/editor/propertyPanelFlatDescriptors.ts b/packages/studio/src/components/editor/propertyPanelFlatDescriptors.ts
new file mode 100644
index 000000000..9a8182975
--- /dev/null
+++ b/packages/studio/src/components/editor/propertyPanelFlatDescriptors.ts
@@ -0,0 +1,20 @@
+import type { ReactNode } from "react";
+
+export type FlatGroupDescriptor = {
+  id: string;
+  title: string;
+  summary?: string;
+  accessory?: ReactNode;
+  content: ReactNode;
+};
+
+// FlatMotionSection never calls these while effect cards are hidden; they only
+// provide its required callback shape on the gated-off path.
+export const EMPTY_GSAP_EFFECT_HANDLERS = {
+  onAddAnimation: () => {},
+  onUpdateProperty: () => {},
+  onUpdateMeta: () => {},
+  onDeleteAnimation: () => {},
+  onAddProperty: () => {},
+  onRemoveProperty: () => {},
+};
diff --git a/packages/studio/src/components/editor/propertyPanelFlatMotionSection.test.tsx b/packages/studio/src/components/editor/propertyPanelFlatMotionSection.test.tsx
index c5f1055b1..ac24d4b37 100644
--- a/packages/studio/src/components/editor/propertyPanelFlatMotionSection.test.tsx
+++ b/packages/studio/src/components/editor/propertyPanelFlatMotionSection.test.tsx
@@ -273,13 +273,14 @@ describe("FlatMotionSection", () => {
     expect(buttons().some((b) => b.textContent === "+ Add effect")).toBe(true);
     act(() => root.unmount());
   });
-});
 
-it("forwards focused bulk segment easing through the flat animation card", () => {
-  const onUpdateKeyframeEase = vi.fn();
-  const onUpdateSegmentEase = vi.fn();
-  usePlayerStore.setState({
-    focusedEaseSegment: {
+  it("forwards focused bulk segment easing through the flat animation card", () => {
+    const onUpdateKeyframeEase = vi.fn();
+    const onUpdateSegmentEase = vi.fn();
+    const store = usePlayerStore.getState();
+    store.beginTimelineSession("project-a");
+    store.setSelectedElementId("index.html#hero");
+    store.setFocusedEaseSegment({
       elementId: "index.html#hero",
       animationId: "a1",
       tweenPercentage: 50,
@@ -287,55 +288,55 @@ it("forwards focused bulk segment easing through the flat animation card", () =>
         { animationId: "a1", tweenPercentage: 50 },
         { animationId: "a2", tweenPercentage: 75 },
       ],
-    },
+    });
+    const { host, root } = renderInto(
+      <FlatMotionSection
+        element={baseElement()}
+        animations={[
+          {
+            id: "a1",
+            method: "to",
+            position: 0,
+            duration: 1,
+            properties: { x: 100 },
+            keyframes: {
+              format: "percentage",
+              keyframes: [
+                { percentage: 0, properties: { x: 0 } },
+                { percentage: 50, properties: { x: 100 } },
+              ],
+            },
+          } as never,
+        ]}
+        showTiming={false}
+        showEffects
+        onSetAttribute={vi.fn()}
+        onAddAnimation={vi.fn()}
+        onUpdateProperty={vi.fn()}
+        onUpdateMeta={vi.fn()}
+        onDeleteAnimation={vi.fn()}
+        onAddProperty={vi.fn()}
+        onRemoveProperty={vi.fn()}
+        onUpdateKeyframeEase={onUpdateKeyframeEase}
+        onUpdateSegmentEase={onUpdateSegmentEase}
+      />,
+    );
+
+    const dropdown = host.querySelector<HTMLButtonElement>("[data-ease-type-dropdown]");
+    expect(dropdown).not.toBeNull();
+    act(() => dropdown?.click());
+    const preset = host.querySelector<HTMLButtonElement>('[data-ease-preset-id="quad-out"]');
+    expect(preset).not.toBeNull();
+    act(() => preset?.click());
+
+    expect(onUpdateSegmentEase).toHaveBeenCalledExactlyOnceWith(
+      [
+        { animationId: "a1", tweenPercentage: 50 },
+        { animationId: "a2", tweenPercentage: 75 },
+      ],
+      "power2.out",
+    );
+    expect(onUpdateKeyframeEase).not.toHaveBeenCalled();
+    act(() => root.unmount());
   });
-  const { host, root } = renderInto(
-    <FlatMotionSection
-      element={baseElement()}
-      animations={[
-        {
-          id: "a1",
-          method: "to",
-          position: 0,
-          duration: 1,
-          properties: { x: 100 },
-          keyframes: {
-            format: "percentage",
-            keyframes: [
-              { percentage: 0, properties: { x: 0 } },
-              { percentage: 50, properties: { x: 100 } },
-            ],
-          },
-        } as never,
-      ]}
-      showTiming={false}
-      showEffects
-      onSetAttribute={vi.fn()}
-      onAddAnimation={vi.fn()}
-      onUpdateProperty={vi.fn()}
-      onUpdateMeta={vi.fn()}
-      onDeleteAnimation={vi.fn()}
-      onAddProperty={vi.fn()}
-      onRemoveProperty={vi.fn()}
-      onUpdateKeyframeEase={onUpdateKeyframeEase}
-      onUpdateSegmentEase={onUpdateSegmentEase}
-    />,
-  );
-
-  const dropdown = host.querySelector<HTMLButtonElement>("[data-ease-type-dropdown]");
-  expect(dropdown).not.toBeNull();
-  act(() => dropdown?.click());
-  const preset = host.querySelector<HTMLButtonElement>('[data-ease-preset-id="quad-out"]');
-  expect(preset).not.toBeNull();
-  act(() => preset?.click());
-
-  expect(onUpdateSegmentEase).toHaveBeenCalledExactlyOnceWith(
-    [
-      { animationId: "a1", tweenPercentage: 50 },
-      { animationId: "a2", tweenPercentage: 75 },
-    ],
-    "power2.out",
-  );
-  expect(onUpdateKeyframeEase).not.toHaveBeenCalled();
-  act(() => root.unmount());
 });
diff --git a/packages/studio/src/components/editor/propertyPanelFlatMotionSection.tsx b/packages/studio/src/components/editor/propertyPanelFlatMotionSection.tsx
index d9d588c83..f3084a447 100644
--- a/packages/studio/src/components/editor/propertyPanelFlatMotionSection.tsx
+++ b/packages/studio/src/components/editor/propertyPanelFlatMotionSection.tsx
@@ -1,20 +1,13 @@
 import { scopedElementKey } from "../../hooks/gsapKeyframeCacheHelpers";
-import { useState } from "react";
 import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
 import { useTrackDesignInput } from "../../contexts/DesignPanelInputContext";
 import type { DomEditSelection } from "./domEditing";
 import { formatTimingValue, RESPONSIVE_GRID } from "./propertyPanelHelpers";
 import { parseTimingValue } from "./propertyPanelTimingSection";
 import { CommitField } from "./propertyPanelPrimitives";
-import { AnimationCard } from "./AnimationCard";
-import {
-  type GsapAnimationEditCallbacks,
-  withTrackedGsapAnimationCallbacks,
-  clearFocusedEaseSegment,
-} from "./gsapAnimationCallbacks";
+import type { GsapAnimationEditCallbacks } from "./gsapAnimationCallbacks";
 import { deriveElementTiming } from "./propertyPanelFlatTimingDerivation";
-import { usePlayerStore } from "../../player";
-import { GsapAddAnimationControl } from "./GsapAddAnimationControl";
+import { GsapAnimationList } from "./GsapAnimationList";
 
 export function FlatTimingRow({
   element,
@@ -136,19 +129,11 @@ export function FlatMotionSection({
   onSetAttributes?: (selection: DomEditSelection, attrs: Record<string, string>) => Promise<void>;
   onAddAnimation: (method: "to" | "from" | "set" | "fromTo") => void;
 } & GsapAnimationEditCallbacks) {
-  const track = useTrackDesignInput();
-  const [addMenuOpen, setAddMenuOpen] = useState(false);
-  const trackedCallbacks = withTrackedGsapAnimationCallbacks(callbacks, track);
-  const focusedEaseSegment = usePlayerStore((s) => s.focusedEaseSegment);
   // Only consume a focus request aimed at the element THIS panel renders (not
   // the store's selectedElementId, which flips synchronously during async
   // selection resolution), so a shared class-selector animation id can't open
   // the wrong element's editor.
   const renderedElementId = scopedElementKey(element);
-  const focusedHere =
-    focusedEaseSegment && focusedEaseSegment.elementId === renderedElementId
-      ? focusedEaseSegment
-      : null;
 
   return (
     <div className="space-y-3">
@@ -174,26 +159,13 @@ export function FlatMotionSection({
             </p>
           )}
           {!multipleTimelines && !unsupportedTimelinePattern && (
-            <div className="space-y-2">
-              {animations.map((anim, index) => (
-                <AnimationCard
-                  {...trackedCallbacks}
-                  key={anim.id}
-                  animation={anim}
-                  defaultExpanded={index === 0}
-                  flat
-                  focusedSegment={focusedHere?.animationId === anim.id ? focusedHere : null}
-                  onFocusSegmentConsumed={clearFocusedEaseSegment}
-                />
-              ))}
-              <GsapAddAnimationControl
-                open={addMenuOpen}
-                setOpen={setAddMenuOpen}
-                onAddAnimation={onAddAnimation}
-                track={track}
-                variant="flat"
-              />
-            </div>
+            <GsapAnimationList
+              {...callbacks}
+              elementId={renderedElementId}
+              animations={animations}
+              onAddAnimation={onAddAnimation}
+              variant="flat"
+            />
           )}
         </>
       )}
diff --git a/packages/studio/src/components/editor/propertyPanelTypes.ts b/packages/studio/src/components/editor/propertyPanelTypes.ts
index 4bb9ed6c1..935ceb3f6 100644
--- a/packages/studio/src/components/editor/propertyPanelTypes.ts
+++ b/packages/studio/src/components/editor/propertyPanelTypes.ts
@@ -123,8 +123,8 @@ export interface PropertyPanelProps {
   ) => void;
   onRemoveKeyframe?: (animationId: string, percentage: number) => void;
   onUpdateKeyframeEase?: (animationId: string, percentage: number, ease: string) => void;
-  onSetAllKeyframeEases?: (animationId: string, ease: string) => void;
   onUpdateSegmentEase?: NonNullable<GsapAnimationEditCallbacks["onUpdateSegmentEase"]>;
+  onSetAllKeyframeEases?: (animationId: string, ease: string) => void;
   onConvertToKeyframes?: (animationId: string, duration?: number) => void;
   onCommitAnimatedProperty?: (
     selection: DomEditSelection,
diff --git a/packages/studio/src/contexts/DomEditContext.tsx b/packages/studio/src/contexts/DomEditContext.tsx
index 53a9039e5..f89e27e91 100644
--- a/packages/studio/src/contexts/DomEditContext.tsx
+++ b/packages/studio/src/contexts/DomEditContext.tsx
@@ -200,8 +200,8 @@ export function DomEditProvider({
     commitMutation,
     applyMarqueeSelection,
     handleUpdateKeyframeEase,
-    handleSetAllKeyframeEases,
     handleUpdateSegmentEase,
+    handleSetAllKeyframeEases,
   },
   children,
 }: {
diff --git a/packages/studio/src/hooks/useDomEditSession.test.tsx b/packages/studio/src/hooks/useDomEditSession.test.tsx
index 061c08690..3c5a3e0ff 100644
--- a/packages/studio/src/hooks/useDomEditSession.test.tsx
+++ b/packages/studio/src/hooks/useDomEditSession.test.tsx
@@ -57,9 +57,9 @@ const recordResolverParity = vi.fn<(...args: unknown[]) => Promise<void>>(async
 const capturedOnReorderShadow: { fn: ((targets: string[]) => void) | undefined } = {
   fn: undefined,
 };
-
 const domEditSelectionRef: { current: DomEditSelection | null } = { current: null };
 const gsapCommitMutation = Object.assign(vi.fn(), { batch: vi.fn() });
+
 vi.mock("../utils/sdkResolverShadow", () => ({
   runResolverShadow: vi.fn(),
   recordResolverParity: (...args: unknown[]) => recordResolverParity(...args),
diff --git a/packages/studio/src/hooks/useDomEditSession.ts b/packages/studio/src/hooks/useDomEditSession.ts
index 2b5e50d37..efec011f9 100644
--- a/packages/studio/src/hooks/useDomEditSession.ts
+++ b/packages/studio/src/hooks/useDomEditSession.ts
@@ -537,11 +537,11 @@ export function useDomEditSession({
     handleGsapRemoveAllKeyframes,
     handleResetSelectedElementKeyframes,
     handleUpdateKeyframeEase,
+    handleUpdateSegmentEase,
     handleSetAllKeyframeEases,
     commitAnimatedProperty,
     commitAnimatedProperties,
     handleSetArcPath,
-    handleUpdateSegmentEase,
     handleUpdateArcSegment,
     handleUnroll,
     invalidateGsapCache: bumpGsapCache,
diff --git a/packages/studio/src/hooks/useGsapKeyframeOps.test.tsx b/packages/studio/src/hooks/useGsapKeyframeOps.test.tsx
index 09d403c67..192b8a925 100644
--- a/packages/studio/src/hooks/useGsapKeyframeOps.test.tsx
+++ b/packages/studio/src/hooks/useGsapKeyframeOps.test.tsx
@@ -12,6 +12,15 @@ import { usePlayerStore } from "../player/store/playerStore";
 import { useGsapKeyframeOps } from "./useGsapKeyframeOps";
 
 type HookApi = ReturnType<typeof useGsapKeyframeOps>;
+type CommitResult = { ok: boolean; changed: boolean };
+type CommitOptions = { onResult?: (result: CommitResult) => void };
+type CommitCall = [selection: unknown, mutation: unknown, options: CommitOptions];
+
+function readCommitOptions(args: unknown[]): CommitOptions {
+  // The hook accepts the production writer type; these test doubles expose only
+  // the third tuple member they exercise.
+  return (args as unknown as CommitCall)[2];
+}
 
 let cleanup: (() => void) | null = null;
 afterEach(() => {
@@ -23,9 +32,7 @@ const selection: DomEditSelection = { id: "box", selector: "#box" } as DomEditSe
 
 function successfulCommitMutation() {
   return vi.fn<(...args: unknown[]) => Promise<unknown>>(async (...args) => {
-    const options = args[2] as {
-      onResult?: (result: { ok: boolean; changed: boolean }) => void;
-    };
+    const options = readCommitOptions(args);
     options.onResult?.({ ok: true, changed: true });
   });
 }
@@ -138,7 +145,7 @@ describe("useGsapKeyframeOps — moveKeyframe settlement", () => {
 
   it("returns false when the writer accepts but does not change the keyframe", async () => {
     const commitMutation = vi.fn(async (...args: unknown[]) => {
-      const options = args[2] as { onResult?: (result: { ok: boolean; changed: boolean }) => void };
+      const options = readCommitOptions(args);
       options.onResult?.({ ok: true, changed: false });
     });
     const { committed, trackGsapSaveFailure } = await moveKeyframeWith(commitMutation);
@@ -206,12 +213,16 @@ describe("useGsapKeyframeOps — keyframe transaction options", () => {
     );
   });
 
-  it("lets the successful commit refresh own delete-all cache invalidation", async () => {
+  it("clears delete-all cache only when persistence confirms the change", async () => {
     let finishCommit: (() => void) | undefined;
     const commitMutationSafely = vi.fn(
-      () =>
+      (...args: unknown[]) =>
         new Promise<void>((resolve) => {
-          finishCommit = resolve;
+          const options = readCommitOptions(args);
+          finishCommit = () => {
+            options.onResult?.({ ok: true, changed: true });
+            resolve();
+          };
         }),
     );
     const api = renderKeyframeOps({
@@ -232,13 +243,42 @@ describe("useGsapKeyframeOps — keyframe transaction options", () => {
     expect(commitMutationSafely).toHaveBeenCalledWith(
       selection,
       { type: "remove-all-keyframes", animationId: "box-to-0-position" },
-      { label: "Remove all keyframes", softReload: true },
+      expect.objectContaining({ label: "Remove all keyframes", softReload: true }),
     );
     expect(usePlayerStore.getState().keyframeCache.get("index.html#box")).toBe(cached);
 
     finishCommit?.();
     await pending;
-    expect(usePlayerStore.getState().keyframeCache.get("index.html#box")).toBe(cached);
+    expect(usePlayerStore.getState().keyframeCache.has("index.html#box")).toBe(false);
+  });
+
+  it("clears the live DOM identity for a selector-only selection", async () => {
+    const element = document.createElement("div");
+    element.id = "box";
+    const selectorOnlySelection: DomEditSelection = {
+      ...selection,
+      id: undefined,
+      selector: ".box",
+      element,
+    };
+    const commitMutationSafely = vi.fn(async (...args: unknown[]) => {
+      const options = readCommitOptions(args);
+      options.onResult?.({ ok: true, changed: true });
+    });
+    const api = renderKeyframeOps({
+      commitMutation: successfulCommitMutation(),
+      commitMutationSafely,
+      trackGsapSaveFailure: vi.fn(),
+    });
+    const cached: KeyframeCacheEntry = {
+      format: "percentage",
+      keyframes: [{ percentage: 0, properties: { x: 0 } }],
+    };
+    usePlayerStore.setState({ keyframeCache: new Map([["index.html#box", cached]]) });
+
+    await api.removeAllKeyframes(selectorOnlySelection, "box-to-0-position");
+
+    expect(usePlayerStore.getState().keyframeCache.has("index.html#box")).toBe(false);
   });
 
   it("threads one coalesce key through skipped convert reload and terminal batch edit", async () => {
diff --git a/packages/studio/src/hooks/useGsapKeyframeOps.ts b/packages/studio/src/hooks/useGsapKeyframeOps.ts
index c24d4fd48..ca77fe0c0 100644
--- a/packages/studio/src/hooks/useGsapKeyframeOps.ts
+++ b/packages/studio/src/hooks/useGsapKeyframeOps.ts
@@ -15,7 +15,11 @@ import {
 } from "../utils/sdkCutover";
 import type { KeyframeCacheEntry } from "../player/store/playerStore";
 import { commitKeyframeAtTimeImpl } from "./gsapKeyframeCommit";
-import { readKeyframeSnapshot, writeKeyframeCache } from "./gsapKeyframeCacheHelpers";
+import {
+  clearKeyframeCacheForElement,
+  readKeyframeSnapshot,
+  writeKeyframeCache,
+} from "./gsapKeyframeCacheHelpers";
 import type {
   CommitMutation,
   CommitMutationOptions,
@@ -331,6 +335,9 @@ export function useGsapKeyframeOps({
   const removeAllKeyframes = useCallback(
     async (selection: DomEditSelection, animationId: string) => {
       const targetPath = selection.sourceFile || activeCompPath || "index.html";
+      // A class/descendant selector can resolve a live element whose selection
+      // deliberately has no id. The cache is still keyed by that DOM id.
+      const cacheElementId = selection.id || selection.element?.id;
       if (sdkSession && sdkDeps) {
         const handled = await sdkGsapRemoveAllKeyframesPersist(
           targetPath,
@@ -339,12 +346,26 @@ export function useGsapKeyframeOps({
           sdkDeps,
           { label: "Remove all keyframes" },
         );
-        if (cutoverCommittedOrThrow(handled)) return;
+        if (cutoverCommittedOrThrow(handled)) {
+          if (cacheElementId) clearKeyframeCacheForElement(targetPath, cacheElementId);
+          return;
+        }
       }
       await commitMutationSafely(
         selection,
         { type: "remove-all-keyframes", animationId },
-        { label: "Remove all keyframes", softReload: true },
+        {
+          label: "Remove all keyframes",
+          softReload: true,
+          // The committed result is the single success boundary: clearing
+          // before it makes failed saves lie, while waiting for the reload leaves
+          // stale diamonds visible during the source round-trip.
+          onResult: (result) => {
+            if (result.changed !== false && cacheElementId) {
+              clearKeyframeCacheForElement(targetPath, cacheElementId);
+            }
+          },
+        },
       );
     },
     [commitMutationSafely, activeCompPath, sdkSession, sdkDeps],
diff --git a/packages/studio/src/player/components/BeatStrip.test.tsx b/packages/studio/src/player/components/BeatStrip.test.tsx
index 4e1f8f569..5d8ac9668 100644
--- a/packages/studio/src/player/components/BeatStrip.test.tsx
+++ b/packages/studio/src/player/components/BeatStrip.test.tsx
@@ -51,8 +51,7 @@ function mountBeatStrip(renderTimeRange?: { start: number; end: number }) {
     scrollWidth: { configurable: true, value: 2_000 },
     scrollHeight: { configurable: true, value: 2_000 },
   });
-  viewport.getBoundingClientRect = () =>
-    ({ left: 0, right: 1_000, top: 0, bottom: 500, width: 1_000, height: 500 }) as DOMRect;
+  viewport.getBoundingClientRect = () => new DOMRect(0, 0, 1_000, 500);
   Object.assign(viewport, {
     setPointerCapture: vi.fn(),
     hasPointerCapture: vi.fn(() => true),
@@ -275,6 +274,74 @@ describe("BeatStrip gesture ownership", () => {
     expect(commitBeatEditsSpy).toHaveBeenCalledOnce();
   });
 
+  it("keeps the dragged beat pinned by time when another beat is inserted before it", () => {
+    const { root } = mountBeatStrip();
+    startBeatDrag();
+    act(() => {
+      window.dispatchEvent(
+        pointerEvent("pointermove", {
+          bubbles: true,
+          clientX: 140,
+          clientY: 100,
+          pointerId: 1,
+        }),
+      );
+      usePlayerStore.setState({
+        beatAnalysis: {
+          ...BEAT_ANALYSIS,
+          beatTimes: [0.5, 1, 3],
+          beatStrengths: [0.3, 0.5, 0.8],
+        },
+      });
+      root.render(<BeatStrip beatTimes={[0.5, 1, 3]} beatStrengths={[0.3, 0.5, 0.8]} pps={100} />);
+    });
+
+    const lefts = Array.from(
+      document.querySelectorAll<HTMLDivElement>('[title="Drag to move · double-click to delete"]'),
+      (beat) => beat.style.left,
+    );
+    expect(lefts).toContain("134px");
+
+    releaseBeatDrag(140);
+    expectCommittedBeatAt(1.4);
+  });
+
+  it("keeps the first pointer in control when a second touch starts", () => {
+    mountBeatStrip();
+    startBeatDrag();
+    const beats = document.querySelectorAll<HTMLDivElement>(
+      '[title="Drag to move · double-click to delete"]',
+    );
+    act(() => {
+      beats[1]?.dispatchEvent(
+        pointerEvent("pointerdown", {
+          bubbles: true,
+          button: 0,
+          clientX: 300,
+          clientY: 100,
+          pointerId: 2,
+        }),
+      );
+    });
+
+    releaseBeatDrag(140, 1);
+    expectCommittedBeatAt(1.4);
+  });
+
+  it("lets Escape bubble before cancelling the active drag", () => {
+    mountBeatStrip();
+    startBeatDrag();
+    const sawEscape = vi.fn();
+    document.addEventListener("keydown", sawEscape, { once: true });
+
+    act(() => {
+      firstBeat().dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true }));
+    });
+
+    expect(sawEscape).toHaveBeenCalledOnce();
+    expectCancelledBeatDrag();
+  });
+
   it("does not autoscroll or mutate below the drag threshold", () => {
     const requestAnimationFrame = vi.fn(() => 1);
     vi.stubGlobal("requestAnimationFrame", requestAnimationFrame);
diff --git a/packages/studio/src/player/components/BeatStrip.tsx b/packages/studio/src/player/components/BeatStrip.tsx
index f62576b04..cbc647527 100644
--- a/packages/studio/src/player/components/BeatStrip.tsx
+++ b/packages/studio/src/player/components/BeatStrip.tsx
@@ -18,7 +18,6 @@ const BEAT_HIT_W = 12; // grab width per beat (px)
 
 interface BeatDragActor {
   readonly pointerId: number;
-  readonly index: number;
   readonly startX: number;
   readonly clientX: number;
   readonly clientY: number;
@@ -68,7 +67,7 @@ function releaseBeatDragResources(actor: BeatDragActor): void {
   window.removeEventListener("pointerup", handleBeatDragPointerUp);
   window.removeEventListener("pointercancel", handleBeatDragPointerCancel);
   window.removeEventListener("lostpointercapture", handleBeatDragPointerCancel);
-  window.removeEventListener("keydown", handleBeatDragKeyDown, true);
+  window.removeEventListener("keydown", handleBeatDragKeyDown);
   window.removeEventListener("blur", cancelBeatDrag);
   try {
     if (actor.scroll.hasPointerCapture?.(actor.pointerId)) {
@@ -186,7 +185,6 @@ function handleBeatDragPointerCancel(event: PointerEvent): void {
 function handleBeatDragKeyDown(event: KeyboardEvent): void {
   if (event.key !== "Escape" || !beatDragActor) return;
   event.preventDefault();
-  event.stopPropagation();
   cancelBeatDrag();
 }
 
@@ -200,7 +198,6 @@ function resolveBeatDragViewport(
 
 function createBeatDragActor(
   event: React.PointerEvent<HTMLDivElement>,
-  index: number,
   originalTime: number,
   pixelsPerSecond: number,
   scroll: HTMLElement,
@@ -210,7 +207,6 @@ function createBeatDragActor(
   if (!musicElement?.src) return null;
   const actor: BeatDragActor = {
     pointerId: event.pointerId,
-    index,
     startX: event.clientX,
     clientX: event.clientX,
     clientY: event.clientY,
@@ -235,15 +231,31 @@ function activateBeatDrag(actor: BeatDragActor): void {
   window.addEventListener("pointerup", handleBeatDragPointerUp);
   window.addEventListener("pointercancel", handleBeatDragPointerCancel);
   window.addEventListener("lostpointercapture", handleBeatDragPointerCancel);
-  window.addEventListener("keydown", handleBeatDragKeyDown, true);
+  window.addEventListener("keydown", handleBeatDragKeyDown);
   window.addEventListener("blur", cancelBeatDrag);
-  unsubscribeBeatDragSession = usePlayerStore.subscribe((state) => {
+  unsubscribeBeatDragSession = usePlayerStore.subscribe((state, previous) => {
+    // Unlike gestures that can validate only at pointerup, beat drag must stop
+    // immediately when its music source disappears or changes mid-stream. This
+    // subscription owns that interruption; the identity guard keeps requestSeek's
+    // per-frame store writes allocation-free unless a source input changed.
+    if (
+      state.timelineSessionEpoch === previous.timelineSessionEpoch &&
+      state.timelineProjectId === previous.timelineProjectId &&
+      state.elements === previous.elements &&
+      state.beatAnalysis === previous.beatAnalysis &&
+      state.beatEdits === previous.beatEdits
+    ) {
+      return;
+    }
     if (!isBeatDragSourceCurrent(actor, state)) cancelBeatDrag();
   });
-  beatDragViewportObserver = new MutationObserver(() => {
-    if (!actor.scroll.isConnected) cancelBeatDrag();
-  });
-  beatDragViewportObserver.observe(document, { childList: true, subtree: true });
+  const viewportParent = actor.scroll.parentNode;
+  if (viewportParent) {
+    beatDragViewportObserver = new MutationObserver(() => {
+      if (!actor.scroll.isConnected) cancelBeatDrag();
+    });
+    beatDragViewportObserver.observe(viewportParent, { childList: true });
+  }
   try {
     actor.scroll.setPointerCapture?.(actor.pointerId);
   } catch {
@@ -256,14 +268,15 @@ function activateBeatDrag(actor: BeatDragActor): void {
 
 function beginBeatDrag(
   event: React.PointerEvent<HTMLDivElement>,
-  index: number,
   originalTime: number,
   pixelsPerSecond: number,
 ): void {
+  // One pointer owns the actor until a terminal event claims it. A second touch
+  // must not silently discard the first gesture and make its release a no-op.
+  if (beatDragActor) return;
   const scroll = resolveBeatDragViewport(event, pixelsPerSecond);
   if (!scroll) return;
-  cancelBeatDrag();
-  const actor = createBeatDragActor(event, index, originalTime, pixelsPerSecond, scroll);
+  const actor = createBeatDragActor(event, originalTime, pixelsPerSecond, scroll);
   if (actor) activateBeatDrag(actor);
 }
 
@@ -365,11 +378,14 @@ export const BeatStrip = memo(function BeatStrip({
   const projectId = usePlayerStore((state) => state.timelineProjectId);
 
   if (!beatTimes || beatsTooDense(beatTimes, pps)) return null;
+  const activeBeatIndex = activeActor
+    ? beatTimes.findIndex((time) => Math.abs(time - activeActor.originalTime) < 1e-3)
+    : -1;
   const drag =
     activeActor &&
     activeActor.sessionEpoch === sessionEpoch &&
     activeActor.projectId === projectId &&
-    Math.abs((beatTimes[activeActor.index] ?? Number.NaN) - activeActor.originalTime) < 1e-3
+    activeBeatIndex >= 0
       ? activeActor
       : null;
   const cy = BEAT_BAND_H / 2;
@@ -377,7 +393,7 @@ export const BeatStrip = memo(function BeatStrip({
     beatTimes,
     beatStrengths,
     renderTimeRange,
-    drag ? new Set([drag.index]) : undefined,
+    drag ? new Set([activeBeatIndex]) : undefined,
   );
 
   return (
@@ -390,7 +406,7 @@ export const BeatStrip = memo(function BeatStrip({
         const strength = Math.pow(Math.min(1, beatStrength ?? 0.5), 2.2);
         const r = 1.5 + strength * 2.5;
         const opacity = 0.25 + strength * 0.75;
-        const dxPx = drag?.index === i ? drag.dx : 0;
+        const dxPx = drag && activeBeatIndex === i ? drag.dx : 0;
         const x = t * pps + dxPx;
         return (
           <div
@@ -412,7 +428,7 @@ export const BeatStrip = memo(function BeatStrip({
               // selection (which otherwise "selects" the whole panel mid-drag).
               e.preventDefault();
               e.stopPropagation();
-              beginBeatDrag(e, i, t, pps);
+              beginBeatDrag(e, t, pps);
             }}
             onDoubleClick={(e) => {
               e.stopPropagation();
diff --git a/packages/studio/src/player/components/KeyframeDiamondContextMenu.tsx b/packages/studio/src/player/components/KeyframeDiamondContextMenu.tsx
index 423e2edd1..67d8cab3f 100644
--- a/packages/studio/src/player/components/KeyframeDiamondContextMenu.tsx
+++ b/packages/studio/src/player/components/KeyframeDiamondContextMenu.tsx
@@ -1,4 +1,3 @@
-import { memo } from "react";
 import { createPortal } from "react-dom";
 import { useContextMenuDismiss } from "../../hooks/useContextMenuDismiss";
 import type { TimelineElement } from "../store/playerStore";
@@ -30,7 +29,7 @@ interface KeyframeDiamondContextMenuProps {
   onMoveToPlayhead?: (element: TimelineElement, keyframe: TimelineKeyframeTarget) => void;
 }
 
-export const KeyframeDiamondContextMenu = memo(function KeyframeDiamondContextMenu({
+export function KeyframeDiamondContextMenu({
   state,
   onClose,
   onDelete,
@@ -104,4 +103,4 @@ export const KeyframeDiamondContextMenu = memo(function KeyframeDiamondContextMe
     </div>,
     document.body,
   );
-});
+}
diff --git a/packages/studio/src/player/components/Timeline.test.ts b/packages/studio/src/player/components/Timeline.test.ts
index 974441f6d..6e9b34a4c 100644
--- a/packages/studio/src/player/components/Timeline.test.ts
+++ b/packages/studio/src/player/components/Timeline.test.ts
@@ -305,7 +305,6 @@ describe("Timeline provider boundary", () => {
     act(() => root.unmount());
   });
 
-  // fallow-ignore-next-line code-duplication
   it("renders the gutter without legacy icons or hue dots", () => {
     const { host, root } = renderBasicTimeline();
 
@@ -404,8 +403,8 @@ describe("Timeline provider boundary", () => {
       );
     });
 
-    const viewport = host.querySelector('[aria-label="Timeline"]')?.firstElementChild;
-    expect(viewport).toBeInstanceOf(HTMLElement);
+    const viewport = host.querySelector<HTMLElement>("[data-timeline-scroll-viewport]");
+    expect(viewport).not.toBeNull();
     act(() => {
       viewport?.dispatchEvent(
         new MouseEvent("pointerdown", {
diff --git a/packages/studio/src/player/components/TimelineOverlays.test.ts b/packages/studio/src/player/components/TimelineOverlays.test.ts
index 67d1c4c97..a53a263ae 100644
--- a/packages/studio/src/player/components/TimelineOverlays.test.ts
+++ b/packages/studio/src/player/components/TimelineOverlays.test.ts
@@ -1,6 +1,21 @@
-import { describe, expect, it } from "vitest";
+// @vitest-environment happy-dom
+import { act, createElement } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import type { TimelineElement } from "../store/playerStore";
-import { resolveTimelineContextElement } from "./TimelineOverlays";
+import { usePlayerStore } from "../store/playerStore";
+import { type KeyframeDiamondContextMenuState } from "./KeyframeDiamondContextMenu";
+import { TimelineOverlays, resolveTimelineContextElement } from "./TimelineOverlays";
+import { defaultTimelineTheme } from "./timelineTheme";
+
+(globalThis as unknown as { IS_REACT_ACT_ENVIRONMENT: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+
+const roots: Root[] = [];
+afterEach(() => {
+  for (const root of roots.splice(0)) act(() => root.unmount());
+  document.body.innerHTML = "";
+  usePlayerStore.setState({ selectedElementId: null, timelineSessionEpoch: 0 });
+});
 
 const captured: TimelineElement = {
   id: "child",
@@ -52,3 +67,95 @@ describe("resolveTimelineContextElement", () => {
     expect(resolveTimelineContextElement({ ...input, elements: [] })).toBeNull();
   });
 });
+
+function renderKeyframeOverlay(options: {
+  capturedElement: TimelineElement;
+  currentElement: TimelineElement;
+  setKfContextMenu?: ReturnType<typeof vi.fn>;
+  onDeleteAllKeyframes?: ReturnType<typeof vi.fn>;
+}) {
+  const container = document.createElement("div");
+  document.body.appendChild(container);
+  const root = createRoot(container);
+  roots.push(root);
+  const elements = [options.currentElement];
+  const setKfContextMenu = options.setKfContextMenu ?? vi.fn();
+  const onDeleteAllKeyframes = options.onDeleteAllKeyframes ?? vi.fn();
+  const menu: KeyframeDiamondContextMenuState = {
+    x: 10,
+    y: 10,
+    sessionEpoch: 2,
+    element: options.capturedElement,
+    elementId: options.capturedElement.key ?? options.capturedElement.id,
+    percentage: 50,
+    animationId: "child-position",
+  };
+
+  act(() => {
+    usePlayerStore.setState({
+      selectedElementId: options.capturedElement.key ?? options.capturedElement.id,
+      timelineSessionEpoch: 2,
+    });
+    root.render(
+      createElement(TimelineOverlays, {
+        elements,
+        elementsRef: { current: elements },
+        theme: defaultTimelineTheme,
+        showShortcutHint: false,
+        showPopover: false,
+        rangeSelection: null,
+        setShowPopover: vi.fn(),
+        setRangeSelection: vi.fn(),
+        kfContextMenu: menu,
+        setKfContextMenu,
+        onDeleteKeyframe: vi.fn(),
+        onDeleteAllKeyframes,
+        onMoveKeyframeToPlayhead: vi.fn(),
+        clipContextMenu: null,
+        setClipContextMenu: vi.fn(),
+        currentTime: 0,
+        onSplitElement: vi.fn(),
+        pinZoomBeforeEdit: vi.fn(),
+        onDeleteElement: vi.fn(),
+        gapContextMenu: null,
+        onDismissGapContextMenu: vi.fn(),
+        onCloseTrackGap: vi.fn(),
+        onCloseAllTrackGaps: vi.fn(),
+        onHoverGapAction: vi.fn(),
+      }),
+    );
+  });
+  return { setKfContextMenu, onDeleteAllKeyframes };
+}
+
+describe("TimelineOverlays context lifecycle", () => {
+  it("dismisses a keyframe menu when its selected target becomes stale", () => {
+    const setKfContextMenu = vi.fn();
+    renderKeyframeOverlay({
+      capturedElement: captured,
+      currentElement: captured,
+      setKfContextMenu,
+    });
+
+    act(() => usePlayerStore.setState({ selectedElementId: "other" }));
+
+    expect(setKfContextMenu).toHaveBeenCalledExactlyOnceWith(null);
+  });
+
+  it("dispatches a menu action with the current model element", () => {
+    const current = { ...captured, start: 4, track: 7 };
+    const onDeleteAllKeyframes = vi.fn();
+    renderKeyframeOverlay({
+      capturedElement: captured,
+      currentElement: current,
+      onDeleteAllKeyframes,
+    });
+    const button = Array.from(document.body.querySelectorAll("button")).find(
+      (candidate) => candidate.textContent === "Delete All Keyframes",
+    );
+
+    act(() => button?.click());
+
+    expect(onDeleteAllKeyframes).toHaveBeenCalledExactlyOnceWith(current, "child-position");
+  });
+});
diff --git a/packages/studio/src/player/components/timelineCallbacks.ts b/packages/studio/src/player/components/timelineCallbacks.ts
index 9533b1745..661c91000 100644
--- a/packages/studio/src/player/components/timelineCallbacks.ts
+++ b/packages/studio/src/player/components/timelineCallbacks.ts
@@ -74,7 +74,6 @@ export interface TimelineEditCallbacks {
   onRazorSplitAll?: (splitTime: number) => Promise<void> | void;
   onDeleteKeyframe?: (elementId: string, keyframe: TimelineKeyframeTarget) => void;
   onDeleteAllKeyframes?: (element: TimelineElement, animationId?: string) => void;
-  onChangeKeyframeEase?: (elementId: string, percentage: number, ease: string) => void;
   onMoveKeyframeToPlayhead?: (element: TimelineElement, keyframe: TimelineKeyframeTarget) => void;
   /** Drag-to-retime: `keyframe` identifies the dragged keyframe (its percentage
    *  is clip-relative), `toClipPercentage` is the neighbour-clamped drop. */
diff --git a/packages/studio/src/player/components/timelineClipDragGestureLifecycle.ts b/packages/studio/src/player/components/timelineClipDragGestureLifecycle.ts
index cfbb38715..674b1f360 100644
--- a/packages/studio/src/player/components/timelineClipDragGestureLifecycle.ts
+++ b/packages/studio/src/player/components/timelineClipDragGestureLifecycle.ts
@@ -388,7 +388,6 @@ export function mountTimelineClipDragGestureLifecycle({
     });
     if (!decision.cancel) return;
     event.preventDefault();
-    event.stopPropagation();
     blockedClipRef.current = null;
     cancelGesture({ suppressClick: decision.suppressClick });
   };
@@ -397,7 +396,7 @@ export function mountTimelineClipDragGestureLifecycle({
   window.addEventListener("pointerup", handleWindowPointerUp);
   window.addEventListener("pointercancel", handleWindowPointerCancel);
   window.addEventListener("lostpointercapture", handleLostPointerCapture);
-  window.addEventListener("keydown", handleWindowKeyDown, true);
+  window.addEventListener("keydown", handleWindowKeyDown);
   return () => {
     cancelGesture({ updateReact: false });
     cancelGestureRef.current = () => false;
@@ -405,6 +404,6 @@ export function mountTimelineClipDragGestureLifecycle({
     window.removeEventListener("pointerup", handleWindowPointerUp);
     window.removeEventListener("pointercancel", handleWindowPointerCancel);
     window.removeEventListener("lostpointercapture", handleLostPointerCapture);
-    window.removeEventListener("keydown", handleWindowKeyDown, true);
+    window.removeEventListener("keydown", handleWindowKeyDown);
   };
 }
diff --git a/packages/studio/src/player/components/useTimelineClipDrag.resize.test.tsx b/packages/studio/src/player/components/useTimelineClipDrag.resize.test.tsx
index 43568db6d..7aae044a7 100644
--- a/packages/studio/src/player/components/useTimelineClipDrag.resize.test.tsx
+++ b/packages/studio/src/player/components/useTimelineClipDrag.resize.test.tsx
@@ -169,7 +169,7 @@ function renderResizeHarness(
     },
     pressEscape() {
       act(() => {
-        window.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true }));
+        scroll.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true }));
       });
     },
     unmount() {
@@ -430,8 +430,11 @@ describe("useTimelineClipDrag — multi-select group resize (restored)", () => {
   it("Escape discards the projection and persists nothing", () => {
     const { h } = startGroupResize();
     expect(h.getResizeProjection()).toHaveLength(2);
+    const sawEscape = vi.fn();
+    document.addEventListener("keydown", sawEscape, { once: true });
 
     h.pressEscape();
+    expect(sawEscape).toHaveBeenCalledOnce();
     expect(h.getResizeProjection()).toHaveLength(0);
     expect(h.storeById("b").duration).toBe(3);
     expect(h.onResizeElement).not.toHaveBeenCalled();
diff --git a/packages/studio/src/player/components/useTimelineKeyframeHandlers.test.tsx b/packages/studio/src/player/components/useTimelineKeyframeHandlers.test.tsx
index f88f521fb..1793a625d 100644
--- a/packages/studio/src/player/components/useTimelineKeyframeHandlers.test.tsx
+++ b/packages/studio/src/player/components/useTimelineKeyframeHandlers.test.tsx
@@ -91,7 +91,7 @@ describe("useTimelineKeyframeHandlers", () => {
     const { root, handlers } = mountHandlers();
     act(() => handlers.onSelectSegment?.(ELEMENT.id, COLLIDING_TARGET));
 
-    expect(usePlayerStore.getState().focusedEaseSegment).toEqual({
+    expect(usePlayerStore.getState().focusedEaseSegment).toMatchObject({
       animationId: "position-tween",
       collidingAnimationTargets: [
         { animationId: "position-tween", tweenPercentage: 100 },
@@ -112,7 +112,7 @@ describe("useTimelineKeyframeHandlers", () => {
     // Selecting a segment must NOT move the playhead.
     act(() => handlers.onSelectSegment?.(ELEMENT.id, FLAT_TWEEN_TARGET));
     expect(onSeek).not.toHaveBeenCalled();
-    expect(usePlayerStore.getState().focusedEaseSegment).toEqual({
+    expect(usePlayerStore.getState().focusedEaseSegment).toMatchObject({
       animationId: "position-tween",
       tweenPercentage: 100,
       elementId: ELEMENT.id,
diff --git a/packages/studio/src/player/store/keyframeSlice.ts b/packages/studio/src/player/store/keyframeSlice.ts
index 9ee447e62..00b0155aa 100644
--- a/packages/studio/src/player/store/keyframeSlice.ts
+++ b/packages/studio/src/player/store/keyframeSlice.ts
@@ -22,6 +22,34 @@ export interface KeyframeCacheEntry {
   easeEach?: string;
 }
 
+export interface FocusedEaseSegment {
+  animationId: string;
+  collidingAnimationTargets?: AnimationKeyframeTarget[];
+  tweenPercentage: number;
+  elementId: string;
+  projectId: string | null;
+  sessionEpoch: number;
+  nonce: number;
+}
+
+type FocusedEaseSegmentTarget = Omit<FocusedEaseSegment, "projectId" | "sessionEpoch" | "nonce">;
+
+interface TimelineSessionIdentity {
+  timelineProjectId: string | null;
+  timelineSessionEpoch: number;
+}
+
+export function isFocusedEaseRequestCurrent(
+  request: FocusedEaseSegment,
+  state: TimelineSessionIdentity & { selectedElementId: string | null },
+): boolean {
+  return (
+    request.projectId === state.timelineProjectId &&
+    request.sessionEpoch === state.timelineSessionEpoch &&
+    request.elementId === state.selectedElementId
+  );
+}
+
 export interface KeyframeSlice {
   /** Selected collapsed (`element:pct`) or expanded (`element:group:animation:clipPct`) diamonds. */
   selectedKeyframes: Set<string>;
@@ -35,22 +63,14 @@ export interface KeyframeSlice {
   /** Union-expand clips (keyframed clips are expanded by default on load). */
   expandClips: (ids: readonly string[]) => void;
 
-  /** elementId scopes the request to one element so a shared (class-selector)
-   * animation id can't open the ease editor on the wrong element. */
-  focusedEaseSegment: {
-    animationId: string;
-    collidingAnimationTargets?: AnimationKeyframeTarget[];
-    tweenPercentage: number;
-    elementId: string;
-  } | null;
-  setFocusedEaseSegment: (
-    target: {
-      animationId: string;
-      collidingAnimationTargets?: AnimationKeyframeTarget[];
-      tweenPercentage: number;
-      elementId: string;
-    } | null,
-  ) => void;
+  /**
+   * Project/session/element-scoped request. Its nonce is monotonic across store
+   * resets so a stale consumer can never collide with a later request.
+   */
+  focusedEaseSegment: FocusedEaseSegment | null;
+  focusedEaseRequestNonce: number;
+  setFocusedEaseSegment: (target: FocusedEaseSegmentTarget) => void;
+  clearFocusedEaseSegment: (nonce: number) => void;
 
   /** Keyframe data per element id, populated from parsed GSAP animations. */
   keyframeCache: Map<string, KeyframeCacheEntry>;
@@ -60,7 +80,10 @@ export interface KeyframeSlice {
   setKeyframeCache: (elementId: string, data: KeyframeCacheEntry | undefined) => void;
 }
 
-export function createKeyframeSlice(set: StoreApi<KeyframeSlice>["setState"]): KeyframeSlice {
+export function createKeyframeSlice(
+  set: StoreApi<KeyframeSlice>["setState"],
+  getTimelineSessionIdentity: () => TimelineSessionIdentity,
+): KeyframeSlice {
   return {
     selectedKeyframes: new Set(),
     toggleSelectedKeyframe: (key) =>
@@ -97,7 +120,25 @@ export function createKeyframeSlice(set: StoreApi<KeyframeSlice>["setState"]): K
       }),
 
     focusedEaseSegment: null,
-    setFocusedEaseSegment: (target) => set({ focusedEaseSegment: target }),
+    focusedEaseRequestNonce: 0,
+    setFocusedEaseSegment: (target) =>
+      set((state) => {
+        const nonce = state.focusedEaseRequestNonce + 1;
+        const { timelineProjectId, timelineSessionEpoch } = getTimelineSessionIdentity();
+        return {
+          focusedEaseRequestNonce: nonce,
+          focusedEaseSegment: {
+            ...target,
+            projectId: timelineProjectId,
+            sessionEpoch: timelineSessionEpoch,
+            nonce,
+          },
+        };
+      }),
+    clearFocusedEaseSegment: (nonce) =>
+      set((state) =>
+        state.focusedEaseSegment?.nonce === nonce ? { focusedEaseSegment: null } : state,
+      ),
 
     keyframeCache: new Map(),
     setKeyframeCache: (elementId, data) =>
diff --git a/packages/studio/src/player/store/playerStore.test.ts b/packages/studio/src/player/store/playerStore.test.ts
index 8ad2cadda..799e3c388 100644
--- a/packages/studio/src/player/store/playerStore.test.ts
+++ b/packages/studio/src/player/store/playerStore.test.ts
@@ -53,6 +53,82 @@ describe("usePlayerStore", () => {
     });
   });
 
+  describe("focused ease requests", () => {
+    it("stamps the current project session and only lets its nonce clear it", () => {
+      const store = usePlayerStore.getState();
+      store.beginTimelineSession("project-a");
+      store.setSelectedElementId("index.html#hero");
+      store.setFocusedEaseSegment({
+        elementId: "index.html#hero",
+        animationId: "animation-a",
+        tweenPercentage: 50,
+      });
+      const first = usePlayerStore.getState().focusedEaseSegment;
+      if (!first) throw new Error("expected focused ease request");
+      expect(first.projectId).toBe("project-a");
+      expect(first.sessionEpoch).toBeGreaterThan(0);
+      expect(first.nonce).toBeGreaterThan(0);
+
+      store.setFocusedEaseSegment({
+        elementId: "index.html#hero",
+        animationId: "animation-a",
+        tweenPercentage: 75,
+      });
+      const second = usePlayerStore.getState().focusedEaseSegment;
+      if (!second) throw new Error("expected replacement request");
+      expect(second.nonce).toBe(first.nonce + 1);
+
+      store.clearFocusedEaseSegment(first.nonce);
+      expect(usePlayerStore.getState().focusedEaseSegment).toBe(second);
+      store.clearFocusedEaseSegment(second.nonce);
+      expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+    });
+
+    it("clears a pending request when the project session changes", () => {
+      const store = usePlayerStore.getState();
+      store.beginTimelineSession("project-a");
+      store.setFocusedEaseSegment({
+        elementId: "index.html#hero",
+        animationId: "animation-a",
+        tweenPercentage: 50,
+      });
+
+      store.beginTimelineSession("project-b");
+      expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+    });
+
+    it("does not revive an old request after selecting away and back", () => {
+      const store = usePlayerStore.getState();
+      store.setSelectedElementId("index.html#a");
+      store.setFocusedEaseSegment({
+        elementId: "index.html#a",
+        animationId: "animation-a",
+        tweenPercentage: 50,
+      });
+
+      store.setSelectedElementId("index.html#b");
+      expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+      store.setSelectedElementId("index.html#a");
+      expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+    });
+
+    it("invalidates on a genuine selection-anchor change but not a same-anchor echo", () => {
+      const store = usePlayerStore.getState();
+      store.setSelection(new Set(["index.html#a", "index.html#b"]), "index.html#a");
+      store.setFocusedEaseSegment({
+        elementId: "index.html#a",
+        animationId: "animation-a",
+        tweenPercentage: 50,
+      });
+      const request = usePlayerStore.getState().focusedEaseSegment;
+
+      store.setSelectionAnchor("index.html#a");
+      expect(usePlayerStore.getState().focusedEaseSegment).toBe(request);
+      store.setSelectionAnchor("index.html#b");
+      expect(usePlayerStore.getState().focusedEaseSegment).toBeNull();
+    });
+  });
+
   describe("setIsPlaying", () => {
     it("sets isPlaying to true", () => {
       usePlayerStore.getState().setIsPlaying(true);
diff --git a/packages/studio/src/player/store/playerStore.ts b/packages/studio/src/player/store/playerStore.ts
index 112c622cd..26323e458 100644
--- a/packages/studio/src/player/store/playerStore.ts
+++ b/packages/studio/src/player/store/playerStore.ts
@@ -352,7 +352,10 @@ export const usePlayerStore = create<PlayerState>((set, get) => ({
   activeTool: "select",
   setActiveTool: (tool) => set({ activeTool: tool }),
 
-  ...createKeyframeSlice(set),
+  ...createKeyframeSlice(set, () => ({
+    timelineProjectId: get().timelineProjectId,
+    timelineSessionEpoch: get().timelineSessionEpoch,
+  })),
 
   activeKeyframePct: null,
   setActiveKeyframePct: (pct) => set({ activeKeyframePct: pct }),
@@ -541,6 +544,7 @@ export const usePlayerStore = create<PlayerState>((set, get) => ({
             selectedElementIds,
             activeKeyframePct: null,
             motionPathArmed: false,
+            focusedEaseSegment: null,
           }
         : { selectedElementId: id, selectedElementIds };
     }),
@@ -550,9 +554,16 @@ export const usePlayerStore = create<PlayerState>((set, get) => ({
   setSelectionAnchor: (id) =>
     set((s) => {
       if (id != null && s.selectedElementIds.size > 1 && s.selectedElementIds.has(id)) {
-        return { selectedElementId: id };
+        return {
+          selectedElementId: id,
+          focusedEaseSegment: id === s.selectedElementId ? s.focusedEaseSegment : null,
+        };
       }
-      return { selectedElementId: id, selectedElementIds: id ? new Set([id]) : new Set<string>() };
+      return {
+        selectedElementId: id,
+        selectedElementIds: id ? new Set([id]) : new Set<string>(),
+        focusedEaseSegment: id === s.selectedElementId ? s.focusedEaseSegment : null,
+      };
     }),
   updateElement: (elementId, updates) =>
     set((state) => ({
@@ -560,9 +571,9 @@ export const usePlayerStore = create<PlayerState>((set, get) => ({
         (el.key ?? el.id) === elementId ? { ...el, ...updates } : el,
       ),
     })),
-  // playbackRate, audioMuted, loopEnabled, zoomMode, and manualZoomPercent are
-  // intentionally absent from createTimelineResetState because they are user
-  // preferences that survive both source refreshes and project switches.
+  // UI preferences intentionally survive reset. So do timelineSessionEpoch and
+  // focusedEaseRequestNonce: the epoch advances only when project identity
+  // changes, while a monotonic nonce prevents collisions with stale consumers.
   beginTimelineSession: (projectId) =>
     set((state) => {
       if (state.timelineProjectId === projectId) return state;
@@ -575,18 +586,15 @@ export const usePlayerStore = create<PlayerState>((set, get) => ({
   reset: () => set(createTimelineResetState()),
 }));
 
-// Bug-bash aid: expose the store so a reproduction can dump live state from the
-// console, e.g. `__playerStore.getState().selectedElementId`. Harmless read
-// handle; no behavioural effect.
-// Only in dev. `import.meta.env` may be undefined in non-Vite bundlers (Next.js
-// Turbopack), so guard the access like the telemetry client does.
 function isDevBuild(): boolean {
   try {
     return import.meta.env.DEV === true;
   } catch {
+    // Turbopack and other non-Vite bundlers may not provide import.meta.env.
     return false;
   }
 }
 if (isDevBuild() && typeof window !== "undefined") {
+  // Console handle for dumping live Studio state during bug-bash reproduction.
   (window as unknown as { __playerStore?: typeof usePlayerStore }).__playerStore = usePlayerStore;
 }